US11678986B2 - Device, system, and method for transcatheter treatment of valve regurgitation - Google Patents
Device, system, and method for transcatheter treatment of valve regurgitation Download PDFInfo
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- US11678986B2 US11678986B2 US17/870,274 US202217870274A US11678986B2 US 11678986 B2 US11678986 B2 US 11678986B2 US 202217870274 A US202217870274 A US 202217870274A US 11678986 B2 US11678986 B2 US 11678986B2
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- A—HUMAN NECESSITIES
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Definitions
- the present invention generally provides improved medical devices, systems, and methods, typically for treatment of heart valve disease and/or for altering characteristics of one or more valves of the body.
- Embodiments of the invention include implants for treatment of mitral valve regurgitation.
- the human heart receives blood from the organs and tissues via the veins, pumps that blood through the lungs where the blood becomes enriched with oxygen, and propels the oxygenated blood out of the heart to the arteries so that the organ systems of the body can extract the oxygen for proper function. Deoxygenated blood flows back to the heart where it is once again pumped to the lungs.
- the heart includes four chambers: the right atrium (RA), the right ventricle (RV), the left atrium (LA) and the left ventricle (LV).
- the pumping action of the left and right sides of the heart occurs generally in synchrony during the overall cardiac cycle.
- the heart has four valves generally configured to selectively transmit blood flow in the correct direction during the cardiac cycle.
- the valves that separate the atria from the ventricles are referred to as the atrioventricular (or AV) valves.
- the AV valve between the left atrium and the left ventricle is the mitral valve.
- the AV valve between the right atrium and the right ventricle is the tricuspid valve.
- the pulmonary valve directs blood flow to the pulmonary artery and thence to the lungs; blood returns to the left atrium via the pulmonary veins.
- the aortic valve directs flow through the aorta and thence to the periphery. There are normally no direct connections between the ventricles or between the atria.
- the mechanical heartbeat is triggered by an electrical impulse which spreads throughout the cardiac tissue. Opening and closing of heart valves may occur primarily as a result of pressure differences between chambers, those pressures resulting from either passive filling or chamber contraction. For example, the opening and closing of the mitral valve may occur as a result of the pressure differences between the left atrium and the left ventricle.
- ventricular filling the aortic and pulmonary valves are closed to prevent back flow from the arteries into the ventricles.
- the AV valves open to allow unimpeded flow from the atria into the corresponding ventricles.
- ventricular systole i.e., ventricular emptying
- the tricuspid and mitral valves normally shut, forming a seal which prevents flow from the ventricles back into the corresponding atria.
- the AV valves may become damaged or may otherwise fail to function properly, resulting in improper closing.
- the AV valves are complex structures that generally include an annulus, leaflets, chordae and a support structure. Each atrium interfaces with its valve via an atrial vestibule.
- the mitral valve has two leaflets; the analogous structure of the tricuspid valve has three leaflets, and apposition or engagement of corresponding surfaces of leaflets against each other helps provide closure or sealing of the valve to prevent blood flowing in the wrong direction. Failure of the leaflets to seal during ventricular systole is known as malcoaptation, and may allow blood to flow backward through the valve (regurgitation).
- Heart valve regurgitation can have serious consequences to a patient, often resulting in cardiac failure, decreased blood flow, lower blood pressure, and/or a diminished flow of oxygen to the tissues of the body. Mitral regurgitation can also cause blood to flow back from the left atrium to the pulmonary veins, causing congestion. Severe valvular regurgitation, if untreated, can result in permanent disability or death.
- a variety of therapies have been applied for treatment of mitral valve regurgitation, and still other therapies may have been proposed but not yet actually used to treat patients. While several of the known therapies have been found to provide benefits for at least some patients, still further options would be desirable.
- pharmacologic agents such as diuretics and vasodilators
- medications can suffer from lack of patient compliance.
- a significant number of patients may occasionally (or even regularly) fail to take medications, despite the potential seriousness of chronic and/or progressively deteriorating mitral valve regurgitation.
- Pharmacological therapies of mitral valve regurgitation may also be inconvenient, are often ineffective (especially as the condition worsens), and can be associated with significant side effects (such as low blood pressure).
- open-heart surgery can replace or repair a dysfunctional mitral valve.
- annuloplasty ring repair the posterior mitral annulus can be reduced in size along its circumference, optionally using sutures passed through a mechanical surgical annuloplasty sewing ring to provide coaptation.
- Open surgery might also seek to reshape the leaflets and/or otherwise modify the support structure.
- open mitral valve surgery is generally a very invasive treatment carried out with the patient under general anesthesia while on a heart-lung machine and with the chest cut open.
- These include devices which seek to re-shape the mitral annulus from within the coronary sinus; devices that attempt to reshape the annulus by cinching either above to below the native annulus; devices to fuse the leaflets (imitating the Alfieri stitch); devices to re-shape the left ventricle, and the like.
- mitral valve replacement implants have been developed, with these implants generally replacing (or displacing) the native leaflets and relying on surgically implanted structures to control the blood flow paths between the chambers of the heart. While these various approaches and tools have met with differing levels of acceptance, none has yet gained widespread recognition as an ideal therapy for most or all patients suffering from mitral valve regurgitation.
- the invention generally provides improved medical devices, systems, and methods.
- the invention provides new implants, implant systems, and methods for treatment of mitral valve regurgitation and other valve diseases.
- the implants will generally include a coaptation assist body which remains within the blood flow path as the valve moves back and forth between an open-valve configuration and a closed valve configuration.
- the coaptation assist bodies or valve bodies may be relatively thin, elongate (along the blood flow path), and/or conformable structures which extend laterally across some, most, or all of the width of the valve opening, allowing coaptation between at least one of the native leaflets and the implant body.
- an implant for treating mal-coaptation of a heart valve the heart valve having an annulus and first and second leaflets with an open configuration and a closed configuration
- the implant comprising a coaptation assist body having an first coaptation surface, an opposed second surface, each surface bounded by a first lateral edge, a second lateral edge, an inferior edge, wherein the inferior edge has a length less than 10 mm, and a superior edge, the superior edge further comprising an annular curve radius, wherein the annular curve radius is concave toward the first coaptation surface and has a length in the range of 25-35 mm, and wherein the element arc length along the coaptation surface of the coaptation assist body between the superior edge and the inferior edge is in the range of 50-60 mm, a first anchor selectively deployable at a first target location of the heart near the midpoint position of the second leaflet on the annulus and couplable to the coaptation assist body near the midpoint of the superior edge curve, and a second
- the first anchor of the implant is deployable superior to the annulus. In some embodiments, the first anchor is deployable into a wall of an atrium. In other embodiments, the first anchor is deployable into a wall of an auricle.
- a coaptation assist body for treating mal-coaptation of a heart valve, the heart valve having an annulus which defines a valve plane, and at least a first and a second leaflet, is provided, the coaptation assist body comprising a first coaptation surface and an opposed second surface, a first lateral edge, a second lateral edge, an inferior edge, and a superior edge, a coaptation zone on the first coaptation surface extending transversely between the inferior edge and the superior edge configured such that a leaflet of the valve may coapt against the coaptation zone, wherein the first coaptation surface has an overall element arc length from the superior edge to the inferior edge in the range of 50-60 mm, and wherein the first coaptation surface generally conforms to a portion of a surface of a cone between the inferior edge and the coaptation zone, and wherein the first coaptation surface comprises a radially outward flare beginning at an inflection point within a range of 30-40 mm from the inferior edge of the coapt
- Some embodiments provide a coaptation assist body for treating mal-coaptation of a heart valve, the heart valve having an annulus and first and second leaflets with a first commissure at a first junction of the first and second leaflets and a second commissure at a second junction of the first and second leaflets, the coaptation assist body comprising a first coaptation surface and an opposed second surface, a first lateral edge, a second lateral edge, an inferior edge, and a superior edge, wherein the superior edge comprises a curve with a length in the range of 25-35 mm, such that the distance between the lateral margins of the superior curve is equivalent to the distance between the first commissure and the second commissure, a coaptation element length measured perpendicular to a valve plane defined by the annulus of the valve between a most proximal extent of the coaptation assist body and the inferior edge of the coaptation assist body, wherein the coaptation element length is in the range of 35-45 mm, a ventricular element length measured perpendic
- the coaptation assist body further comprises a first connection element near the midpoint of the superior edge coupleable with a first anchor for deployment in a heart structure. Some embodiments further comprise a second connection element at the inferior edge coupleable with a second anchor for deployment in a heart structure of the ventricle.
- the anterior surface and posterior surface of the coaptation assist body further comprise a covering comprised of ePTFE, polyurethane foam, polycarbonate foam, biologic tissue such as porcine pericardium, or silicone.
- At least one strut is disposed within the covering material for maintenance of a shape of the coaptation assist body.
- at least one strut is connected to the second connection element and extends toward the superior edge of the implant.
- the strut is composed of Nitinol, polypropylene, stainless steel, or any other suitable material.
- a first strut extends from the second connection near one lateral edge to the superior edge and a second strut extends from the second connection near the second lateral edge to the superior edge of the implant such that the struts assist in maintaining the distance between the lateral margins of the superior edge
- Methods are provided for treating mal-coaptation of a heart valve in a patient, the heart valve having an annulus and first and second leaflets, the first and second leaflets each comprising a proximal surface, a distal surface, a coaptation edge and an annular edge; the annulus further defining a valve plane, the valve plane separating an atrium proximally and a ventricle distally.
- Some methods comprise selectively deploying a first anchor into heart tissue distal to the annulus, selectively deploying a second anchor proximal to the annulus near a mid-point of the annular edge of the second leaflet, and coupling the first anchor and the second anchor to a coaptation assist body comprising a coaptation surface and a leaflet surface such that the coaptation assist body is suspended across the valve plane from the atrium proximally to the ventricle distally.
- the coaptation assist body is suspended such that the coaptation surface coapts with the first leaflet and the leaflet surface of the coaptation assist body overlays the second leaflet such that mal-coaptation is mitigated.
- FIG. 1 A- 1 F schematically illustrate some of the tissues of the heart and mitral valve, as described in the Background section and below, and which may interact with the implants and systems described herein.
- FIGS. 3 A- 3 B illustrate a simplified cross-section of a heart, schematically showing mitral valve regurgitation during systole in the setting of mal-coaptation of the mitral valve leaflets.
- FIG. 4 A illustrates a stylized cross section of a heart, showing mitral valve mal-coaptation in the settings of functional mitral valve regurgitation.
- FIG. 4 B illustrates a stylized cross section of a heart, showing mitral valve mal-coaptation in the settings of degenerative mitral valve regurgitation.
- FIGS. 5 A- 5 F illustrate embodiments of an implant deployed within the mitral valves of 4 A and 4 B so as to mitigate the mal-coaptation by establishing a new coaptation point.
- FIGS. 6 A- 6 B illustrate the implants of 5 A and 5 B respectively during diastole, allowing free blood flow between the atrium and ventricle.
- FIGS. 7 A- 7 C illustrate alternative configurations of coaptation element attachment to cardiac structures.
- FIGS. 8 A- 8 B show an embodiment of the coaptation enhancement element.
- FIG. 9 shows another embodiment of a coaptation enhancement element with atrial and ventricular anchors.
- FIG. 10 A schematically illustrates an embodiment of a coaptation enhancement element
- FIG. 10 B schematically illustrates an embodiment of the support structure and anchor attachments of a coaptation enhancement element
- FIG. 10 C schematically illustrates a lateral view of an embodiment of the coaptation element implanted across a mitral valve.
- FIG. 10 D schematically illustrates an embodiment of a coaptation element with proximal support structure
- FIG. 10 E schematically illustrates another embodiment of a coaptation element with proximal support structure
- FIG. 10 F schematically illustrates a heart with an embodiment of the coaptation element implanted across the mitral valve.
- FIGS. 11 A-B show a coaptation enhancement element with atrial and ventricular anchors attached and mounted to anchor drivers.
- FIGS. 11 C-D show two views of a coaptation enhancement element with multiple annular or atrial anchor eyelets and ventricular pledget.
- FIG. 11 E shows the coaptation enhancement element of FIGS. 11 C-D with delivery catheter and ventricular anchor.
- FIG. 12 A schematically illustrates an embodiment of the coaptation element in its collapsed state
- FIG. 12 B schematically illustrates the coaptation element of 12 A with anchors attached and mounted to anchor drivers
- FIG. 12 C schematically illustrates the coaptation element deployed across the mitral valve.
- FIGS. 13 F, 13 G, and 13 H illustrate the geometry of an embodiment of the coaptation element juxtaposed on a cone.
- FIG. 13 I illustrates the geometry of an embodiment of the coaptation element juxtaposed on a depiction of Gabriel's horn.
- FIG. 13 J illustrates the geometry of an embodiment of the coaptation element with a ventricular anchor extending from a tether and annular reinforcement ring.
- FIG. 14 A- 14 C schematically illustrate features of an embodiment of the coaptation enhancement element.
- FIG. 16 C schematically illustrates an embodiment of a delivery system for a transcatheter technique
- FIG. 16 D schematically illustrates a transseptal sheath and delivery system deployed into the left atrium and ventricle of a heart
- FIG. 16 E illustrates the transseptal sheath and delivery system in use during placement of atrial and ventricular anchors of an embodiment of the coaptation element
- FIG. 16 F illustrates an embodiment of the coaptation element in relation to cardiac structures during placement
- FIG. 16 G illustrates evaluation of mitigation of mitral valve regurgitation after final placement of an embodiment of the coaptation element.
- FIG. 17 D schematically illustrates the proximal portion of an anchor delivery system in the anchor release position.
- FIG. 17 E schematically illustrates the distal portion of an anchor delivery system in the anchor release position
- FIG. 17 J schematically illustrates the distal end of an anchor driver, with anchor released from the driver for testing.
- the present invention generally provides improved medical devices, systems, and methods, often for treatment of mitral valve regurgitation and other valve diseases including tricuspid regurgitation. While the description that follows includes reference to the anterior leaflet in a valve with two leaflets such as the mitral valve, it is understand that “anterior leaflet” could refer to one or more leaflets in valve with multiple leaflets. For example, the tricuspid valve has 3 leaflets so the “anterior” could refer to one or two of the medial, lateral, and posterior leaflets.
- the implants described herein will generally include a coaptation assist body (sometimes referred to herein as a valve body) which is generally along the blood flow path as the leaflets of the valve move back and forth between an open-valve configuration (with the anterior leaflet separated from valve body) and a closed-valve configuration (with the anterior leaflet engaging opposed surfaces of the valve body).
- the valve body will be disposed between the native leaflets to close the gap caused by mal-coaptation of the native leaflets by providing a surface for at least one of the native leaflets to coapt against, while effectively replacing a second native leaflet in the area of the valve which, were it functioning normally, it would occlude during systole.
- the coaptation assistance devices, implants, and methods described herein may be configured for treating functional and/or degenerative mitral valve regurgitation (MR) by creating an artificial coaptation zone within which at least one of the native mitral valve leaflets can seal.
- MR degenerative mitral valve regurgitation
- the structures and methods herein will largely be tailored to this application, though alternative embodiments might be configured for use in other valves of the heart and/or body, including the tricuspid valve, valves of the peripheral vasculature, the inferior vena cava, or the like.
- the mitral valve 60 is disposed between the left atrium 10 and left ventricle 30 . Also shown are the tricuspid valve 50 which separates the right atrium 20 and right ventricle 40 , the aortic valve 80 , and the pulmonary valve 70 .
- the mitral valve 60 is composed of two leaflets, the anterior leaflet 12 and posterior leaflet 14 . In a healthy heart, the edges of the two leaflets appose during systole at the coaptation zone 16 .
- the fibrous annulus 120 provides attachment for the two leaflets of the mitral valve, referred to as the anterior leaflet 12 and the posterior leaflet 14 .
- the leaflets are axially supported by attachment to the chordae tendinae 32 .
- the chordae attach to one or both of the papillary muscles 34 , 36 of the left ventricle.
- the chordae support structures tether the mitral valve leaflets, allowing the leaflets to open easily during diastole but to resist the high pressure developed during ventricular systole.
- the shape and tissue consistency of the leaflets helps promote an effective seal or coaptation.
- the leading edges of the anterior and posterior leaflet come together along a funnel-shaped zone of coaptation 16 , with a lateral cross-section 160 of the three-dimensional coaptation zone (CZ) being shown schematically in FIG. 1 E .
- the anterior and posterior mitral leaflets are dissimilarly shaped.
- the anterior leaflet is more firmly attached to the annulus overlying the central fibrous body (cardiac skeleton), and is somewhat stiffer than the posterior leaflet, which is attached to the more mobile posterior mitral annulus.
- Approximately 80 percent of the closing area is the anterior leaflet.
- Adjacent to the commissures 110 , 114 , on or anterior to the annulus 120 lie the left (lateral) 124 and right (septal) 126 fibrous trigones which are formed where the mitral annulus is fused with the base of the non-coronary cusp of the aorta ( FIG. 1 F ).
- the fibrous trigones 124 , 126 form the septal and lateral extents of the central fibrous body 128 .
- the fibrous trigones 124 , 126 may have an advantage, in some embodiments, as providing a firm zone for stable engagement with one or more annular or atrial anchors.
- the coaptation zone CL between the leaflets 12 , 14 is not a simple line, but rather a curved funnel-shaped surface interface.
- the first 110 (lateral or left) and second 114 (septal or right) commissures are where the anterior leaflet 12 meets the posterior leaflet 14 at the annulus 120 . As seen most clearly in the axial views from the atrium of FIGS.
- a properly functioning mitral valve 60 of a heart is open during diastole to allow blood to flow along a flow path FP from the left atrium toward the left ventricle 30 and thereby fill the left ventricle.
- the functioning mitral valve 60 closes and effectively seals the left ventricle 30 from the left atrium 10 during systole, first passively then actively by increase in ventricular pressure, thereby allowing contraction of the heart tissue surrounding the left ventricle to advance blood throughout the vasculature.
- FIGS. 3 A- 3 B and 4 A- 4 B there are several conditions or disease states in which the leaflet edges of the mitral valve fail to appose sufficiently and thereby allow blood to regurgitate in systole from the ventricle into the atrium. Regardless of the specific etiology of a particular patient, failure of the leaflets to seal during ventricular systole is known as mal-coaptation and gives rise to mitral regurgitation.
- mal-coaptation can result from either excessive tethering by the support structures of one or both leaflets, or from excessive stretching or tearing of the support structures.
- Other, less common causes include infection of the heart valve, congenital abnormalities, and trauma.
- Valve malfunction can result from the chordae tendineae becoming stretched, known as mitral valve prolapse, and in some cases tearing of the chordae 215 or papillary muscle, known as a flail leaflet 220 , as shown in FIG. 3 A .
- the leaflet tissue itself the valves may prolapse so that the level of coaptation occurs higher into the atrium, opening the valve higher in the atrium during ventricular systole 230 . Either one of the leaflets can undergo prolapse or become flail. This condition is sometimes known as degenerative mitral valve regurgitation.
- annular dilation 240 Such functional mitral regurgitation generally results from heart muscle failure and concomitant ventricular dilation. And the excessive volume load resulting from functional mitral regurgitation can itself exacerbate heart failure, ventricular and annular dilation, thus worsening mitral regurgitation.
- FIG. 4 A- 4 B illustrate the backflow BF of blood during systole in functional mitral valve regurgitation ( FIG. 4 A ) and degenerative mitral valve regurgitation ( FIG. 4 B ).
- the increased size of the annulus in FIG. 4 A coupled with increased tethering due to hypertrophy of the ventricle 320 and papillary muscle 330 , prevents the anterior leaflet 312 and posterior leaflet 314 from apposing, thereby preventing coaptation.
- the tearing of the chordae 215 causes prolapse of the posterior leaflet 344 upward into the left atrium, which prevents apposition against the anterior leaflet 342 . In either situation, the result is backflow of blood into the atrium, which decreases the effectiveness of left ventricle compression.
- FIG. 5 A- 5 B an embodiment of a coaptation enhancement element 500 can be seen in functional ( FIG. 5 A ) and degenerative ( FIG. 5 B ) mitral valve regurgitation.
- the element may be deployed in this embodiment so that it overlies the posterior leaflet 514 , the chordae and papillary muscle.
- the element attaches superiorly to the posterior aspect of the annulus 540 and inferiorly to the posterior aspect of the left ventricle 550 via annular anchor 546 and ventricular anchor 556 .
- more than one annular anchor and/or more than one ventricular anchor may be used to attach the coaptation enhancement element.
- the one or more annular anchors may be replaced by or supplemented with one or more atrial or auricular anchors.
- the coaptation element may attach to the superior surface of the posterior annulus, the posterior atrial wall, or the annulus itself.
- a coaptation zone 516 has been established between the implant 500 and the native anterior leaflet 512 . Similar implants can be used in both functional and degenerative mitral valve regurgitation because the failure of leaflet coaptation occurs in both, regardless of the mechanism behind the dysfunction. Therefore, as seen in FIGS.
- different sized coaptation enhancement elements can be placed such that the native anterior leaflet 512 apposes the coaptation element at the appropriately established coaptation point 510 , blocking flow F of blood during contraction of the ventricle.
- a variety of sizes of implants are provided, with differing dimensions configured to fit varying anatomies.
- there may be an implant height 530 which measures from the superior annular attachment site 540 to the inferior ventricular attachment site 550 in a plane basically perpendicular to the plane defined by the annulus of the valve, an implant depth 520 between the coaptation point 510 and the superior attachment site 540 , and an implant projection 560 between the posterior wall at the level of the coaptation point and the coaptation point.
- the implant 500 may stay in substantially the same position, while movement of the native anterior leaflet opens the valve, permitting flow F of blood from the left atrium to the left ventricle with minimal restriction.
- the surface of the implant 500 may balloon or stretch upwards during ventricular systole, while the anchors remain unmoved. This may be advantageous as enhancing the seal between the anterior or coaptation surface of the element and the native leaflet at the coaptation zone during systole.
- the surface may return to an initial position in which it lies more distally. This may provide an improved blood flow path between the atrium and ventricle during diastole, improving outflow from the atrium past the coaptation assist element.
- FIGS. 5 and 6 illustrate one embodiment of the coaptation enhancement element, in which the native posterior leaflet is left in position, and the implant is attached superiorly to the posterior annulus or adjacent atrial wall.
- Many possible alternate embodiments may have differing attachment mechanisms.
- the posterior leaflet is not present, having been removed surgically or the result of disease.
- the native leaflet attaches to the posterior surface of the coaptation body.
- the coaptation element may attach to the anterior surface of the posterior leaflet 514 , rather than the annulus or atrial wall.
- an anchoring structure (not shown) could pass from the coaptation element, through the atrial wall into the coronary sinus, wherein the anchoring structure attaches to a mating structure in the coronary sinus.
- the anchoring structure which could be a mechanical structure or a simple suture, can pass through the atrial wall and be anchored by a knot or mechanical element, such as a clip, on the epicardial surface of the heart.
- attachment inferiorly may be to the ventricular muscle, through the apex into the epicardium or pericardium and secured from outside, or at other attachment sites using alternative attachment means.
- the deployed coaptation assist implant described herein may exhibit a number of desirable characteristics. Some embodiments need not rely on reshaping of the mitral annulus (such as by thermal shrinking of annular tissue, implantation of an annular ring prosthesis, and/or placement of a cinching mechanism either above or beneath the valve plane, or in the coronary sinus or related blood vessels). Advantageously, they also need not disrupt the leaflet structure or rely on locking together or fusing of the mitral leaflets. Many embodiments can avoid reliance on ventricular reshaping, and after implantation represent passive implanted devices with limited excursion which may result in very long fatigue life. Thus, the implant can be secured across a posterior leaflet while otherwise leaving native heart (e.g., ventricular, mitral annulus, etc) anatomy intact.
- native heart e.g., ventricular, mitral annulus, etc
- Mitigation of mitral valve mal-coaptation may be effective irrespective of which leaflet segment(s) exhibit mal-coaptation.
- the treatments described herein will make use of implants that are repositionable during the procedure, and even removable after complete deployment and/or tissue response begins or is completed, often without damaging the valve structure. Nonetheless, the implants described herein may be combined with one or more therapies that do rely on one or more of the attributes described above as being obviated.
- the implants themselves can exhibit benign tissue healing and rapid endothelialization which inhibits migration, thromboembolism, infection, and/or erosion.
- the coaptation assist body will exhibit no endothelialization but its surface will remain inert, which can also inhibit migration, thromboembolism, infection and/or erosion.
- FIG. 8 A- 8 B show two views of an embodiment of a coaptation enhancement element comprising a first surface 810 disposed toward a mal-coapting native leaflet, in the instance of a mitral valve, the posterior leaflet and a second surface 820 which may be disposed toward the anterior leaflet.
- the superior edge 840 of the implant may be curved to match the general shape of the annulus or adjoining atrial wall.
- the coaptation assistance element has a geometry which permits it to traverse the valve between attachment sites in the atrium and ventricle, to provide a coaptation surface for the anterior leaflet to coapt against, and attach to the atrium or annulus such that it effectively seals off the posterior leaflet, or in the instance that the leaflet is or has been removed, that it replaces the posterior leaflet.
- FIGS. 13 A-H , 14 A-C, and 15 A-B illustrate that geometry.
- FIG. 13 A shows an oblique view of the coaptation assistance element 500 , with annular anchor site 562 and ventricular anchor hub 564 . While an annular anchor site is shown extending posteriorly from the body of coaptation assistance element, in an alternate embodiment the anchor site could be on the anterior surface.
- Passive or active commissural hubs 880 may define a diameter D 1 , which may in some embodiments correspond to the distance between the first and second lateral commissures of the native valve 110 or the intracommissural distance (ICD).
- D 1 may range, in various sizes of implants, between 20-60 mm with, in some embodiments, a preferred length between 35-45 mm, as corresponding most closely to the widest range of human mitral ICD.
- FIG. 13 A further illustrates coaptation element height H, corresponding to the distance between the ventricular anchor site and the atrial anchor site as measured perpendicular to the plane defined by the annulus of the valve.
- Coaptation element height of some embodiments may be 30-80 mm, with some embodiments ranging between 40-55 mm.
- FIG. 13 B illustrates the coaptation element in an end view, from proximal to the element.
- D 1 is illustrated, and measures the distance between the medial edge and the lateral edge of the coaptation element at the level of the valve.
- D 1 may be the distance from the right to left fibrous trigones 124 , 126 ( FIG. 1 F ).
- measurement D 2 which measures the distance from posterior to anterior between the most posterior point of R 2 and center line CL connecting the medial and lateral edges of the coaptation element at the level of the valve.
- D 2 may range between about 3 and about 10 mm. In one embodiment D 2 may be about 6 mm. In another embodiment, D 2 is about one-third of the distance between the midpoint of the posterior annulus and the midpoint of the anterior annulus. In some embodiments, D 2 may be one-sixth to one half of the distance between the midpoint of the posterior annulus and the midpoint of the anterior annulus.
- the coaptation zone curve radius (or short axis) R 2 of the coaptation element is illustrated in FIG. 13 B .
- the short axis is a transverse measurement of the coaptation element at the level of the heart valve.
- the anterior surface at the level of the coaptation zone is the portion of the implant which the anterior leaflet coapts against during systole.
- the coaptation zone radius in embodiments may be in the range of 20-60 mm, with preferred coaptation zone radius measurements in the 35-45 mm range, as corresponding favorably to a wide variety of patient measurements.
- the annular curve radius R 1 of the coaptation element is the measurement of the proximal or superior edge of the coaptation element.
- the annular curve radius may be in the range of 15-50 mm. In other embodiments, R 1 may be between 25-35 mm.
- FIGS. 13 A and 13 C illustrate the generally triangular shape of embodiments of the implant, such that the coaptation implant has a superior edge 578 , lateral edges 572 and 574 , and inferior edge 576 , wherein the superior edge 578 has a length greater than that of inferior edge 576 , such that the transverse distance between lateral edges 572 and 574 generally decreases from superior to inferior on the implant.
- the superior edge length may be in the range of 15-50 mm, or 25-35 mm, while the inferior edge length may be in the range of 1-15 mm, or 2-6 mm.
- FIG. 13 D illustrates a side view of one embodiment of the coaptation implant. Illustrated is a coaptation element length L 1 , corresponding to the distance between the most proximal measurement of the coaptation element and the ventricular anchor site as measured perpendicular to the plane defined by the annulus of the valve.
- the anticipated range in provided coaptation element lengths may be between 20-80 mm, with a preferred element length between about 35 and about 45 mm, as corresponding most closely to the majority of patients.
- a ventricular element length L 2 This corresponds to the distance between the level of the valve and the ventricular anchor site as measured perpendicular to the plane defined by the annulus of the valve.
- the anticipated range in ventricular element length may be 10 to 70 mm, with a preferred ventricular element length range of 25-35 mm.
- the coaptation element length L 1 and the ventricular element length L 2 can be further described by a element length ratio L 2 :L 1 .
- the element length ratio may be about, at least about, or no more than about 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, or 0.9.
- the overall element arc length L 3 is the measurement from the superior edge to the inferior edge of the coaptation element measured along the implant.
- the overall element length may range between 25-100 mm. In some embodiments, L 3 will range between about 50-60 mm.
- Table 1 illustrates dimensional measurements for some embodiments in column 2, and specific dimensions for one contemplated embodiment in column 3.
- the line 622 , 620 connecting the endpoints of the base arc can be described as perpendicular to the longitudinal axis of the Gabriel's horn, and laterally offset from the long axis by a distance of at least about 6 mm.
- the coaptation element takes an approximately hexagonal shape with a tether connection 864 running from the inferior surface 764 of the coaptation element to the ventricular anchor 866 and ventricular anchor hub 864 .
- the lateral edges 572 , 574 travel from the superior edge 578 essentially perpendicular to superior edge 578 through the coaptation zone 920 . This provides a broad surface for a native leaflet to coapt against.
- lateral edges 572 , 574 converge toward inferior edge 576 such that the distance between lateral edges 572 , 574 diminishes from proximal to distal toward the inferior edge 576 .
- the coaptation zone length L 4 measured between the superior edge and the point where the lateral edges begin to converge, is configured to provide an adequate coaptation zone between the anterior leaflet and the leaflet facing surface of the implant, and has length L 4 of between 5 and 30 mm, preferably about 15-25 mm.
- the lateral edges, 562 , 564 may extend substantially perpendicularly with respect to the superior edge 568 for distance L 4 to provide a broad surface for the native leaflet to coapt against.
- the long axis of the posterior leaflet curve generally describes the path of the posterior leaflet complex from the ventricle through the papillary muscles, the chordae tendinae, the leaflet itself, and posteriorly toward the annulus/posterior wall of the atrium. It may be important that the curve of the implant generally correspond to the posterior leaflet curve at or near the end of ventricular systole, in order to correspond substantially to native anatomy when the coaptation element is placed over the posterior leaflet, and maintain relatively normal chamber size and geometry. In some embodiments, the curve of the implant changes over the course of the heart cycle, such that the coaptation zone of the implant behaves similarly to the lip of the posterior leaflet.
- the valve body covering can include a foam material surrounded by ePTFE. Use of sponge or foam material enhances the capability of having the implant fold to a small enough diameter to pass through a catheter.
- the valve body covering has no pores, or may have micropores to enhance endothelialization and cellular attachment.
- the valve body may also incorporate a radiopaque material or an echo-enhancement material for better visualization. Any support structures of the valve body or support interface having a frame may be coated with radio-opaque materials such as gold or platinum or impregnated with barium.
- the leaflet apposing valve body element 860 may be coated with an echo enhancement material.
- FIG. 9 An alternative embodiment of the coaptation assistance device is shown in FIG. 9 .
- Struts 830 are shown in a different configuration, in which one or more curve laterally toward the superior edge to assist in maintaining the shape of the proximal portion upon deployment.
- an atrial hub 862 for connection to annular or atrial anchor 863 and a ventricular hub 864 for connection to ventricular anchor 866 .
- Alternate engagement means are contemplated for connecting the device to each anchor, including the portrayed eyelets and hubs, but also including other connection means known to one skilled in the art, such as, for example, sutures, staples, adhesive or clips.
- the anchors may form an integrated part of the device.
- both anchors shown are helical anchors. There are many possible configurations for anchoring means, compositions of anchors, and designs for anchoring means.
- the ventricular anchor may comprise a helix rotatable with respect to the leaflet apposing element and connected to the hub of the leaflet apposing element by a suture or ePTFE tube.
- a ventricular anchor may be included in the form of a tether or other attachment means extending from the valve body thru the ventricle septum to the right ventricle, or thru the apex into the epicardium or pericardium, which may be secured from outside the heart in and combined endo/epi procedure.
- helical anchors may comprise bio-inert materials such as Platinum/Ir, a Nitinol alloy, and/or stainless steel.
- a coupling mechanism on one or both commissural aspects of the atrial portion of the device which may be configured to engage active anchors 886 via eyelet 884 or hub, as shown in FIGS. 10 D and 10 E .
- a support may be placed along the annular margin of the element to assist in maintaining the curvature of the element.
- FIGS. 10 D and 10 E show another embodiment in which an annular ring 890 , comprising of a material such as Nitinol cable or a deformable plastic, is placed at or near the superior edge of the coaptation element and in the same plane.
- this annular ring may terminate laterally in a hub or eyelet for active commissural anchors 884 , while in other embodiments it may terminate laterally in a passive anchor.
- the annular ring as thus contemplated provides assistance in maintaining the desired proximal geometry of the coaptation assist element.
- the annular ring may, for example, be planar, or it may be saddle shaped to correspond with the three dimensional shape of the native valvular annulus.
- the coaptation element 500 when deployed in the heart attaches via ventricular anchor 866 distal to the mitral valve along the path of blood flow, traverses the valve, and attaches proximally in the atrium such that it functionally replaces the posterior leaflet 16 , which may be covered by the element or removed in part or totally, the element coapting to the anterior leaflet and providing coverage posteriorly from the coaptation zone to the periphery of the annular ring. It is contemplated that the coaptation element will experience some motion and deformation as the surrounding cardiac structures move in relation to one another during the cardiac cycle; however, repetitive stresses on the device are minimized by its relatively stationary position, lessening the possibility of fatigue over time and maximizing the life of the implant. Materials used in the covering and frame of the element may be chosen with this in mind.
- the coaptation element may be designed to permit relatively normal circulation of blood in the ventricular chamber, as it may be elongate and narrow between the anterior and posterior surfaces, taking up minimal space and allowing movement of blood from one side to another and past both lateral aspects of the element. As can be seen in FIG.
- struts made of Nitinol, stainless steel, or other appropriate materials, can substantially assist in maintain the geometry of the implant, permitting choice of any of a wide variety of covering materials best suited for long term implantation in the heart and for coaptation against the anterior leaflet.
- FIGS. 11 A- 11 B and 12 A- 12 C an embodiment of the coaptation assistance device 500 is shown with ventricular hub 864 engaging ventricular anchor 866 and annular eyelet 862 engaging annular anchor 863 .
- Each anchor may be engaged at its proximal end by a driver 870 .
- the drivers are seen emerging from placement catheter 872 . It can be seen that in some embodiments, the device can be assembled extra-corporeally, engaging the anchors to the device and the drivers to the anchors. The drivers can then be withdrawn into the catheter, with the device in its collapsed position as shown in FIG. 12 A 500 . The drivers may be separately manipulated by the surgeon to place the anchors in the appropriate positions.
- FIG. 11 C illustrates the coaptation element after placement, entirely covering the posterior leaflet 14 so that it coapts with the anterior leaflet 12 during systole and, with the native anterior leaflet, maintains the valve seal at the annular ring.
- FIGS. 11 C-E Another embodiment of the coaptation assist element may be seen in FIGS. 11 C-E .
- a number of coaptation element struts 830 run from the inferior edge 576 of the implant along the longitudinal axis.
- the struts may connect inferiorly to each other or to a ventricular hub. Alternatively, they may connect to a ventricular anchor pledget 762 , as seen in FIGS. 11 C-E .
- Each strut may terminate inferiorly within the covering of the element.
- Each strut may comprise a single longitudinal element or be doubled over to comprise two or more strands. As shown in FIGS.
- a single strut may be comprised of a strand of Nitinol wire or other material which loops toward the superior aspect of the implant.
- This loop area may, as shown in the Figures, provide reinforcement around an interruption in the covering material, such as for an annular anchor eyelet 732 , from which an anchor may be deployed, either directly or with one or more intervening connecting structures, such as a tether and attached hub.
- the struts 830 may be, as shown, placed such that they are relatively evenly spaced, or may be concentrated toward the center or lateral edges 572 , 574 .
- the annular anchor eyelet may be coupleable with an anchor or anchoring element which may be deployed into the mitral annulus, left atrium, left auricle, or one of the fibrous trigones.
- An additional annular reinforcement strut 730 may be provided at or near the superior edge of the element 578 . This may terminate at or near the lateral edges 572 , 574 , or may continue past as part of one or more commissural anchors.
- the annular reinforcement strut 730 may connect with one or more longitudinal struts 830 , or as shown, may be placed superiorly within the covering material, such that it is more easily compacted for delivery via catheter. This may also provide increased durability for the implant if the annular reinforcement strut 730 reinforces the tethering to the annulus or atrium, while the longitudinal struts, which provide support during upward ballooning or stretching of the body of the coaptation element during ventricular systole, may have increased ability to move slightly away from each other laterally during systole and towards each other during diastole.
- Maintaining a separation between the transverse annular reinforcement strut 730 and the longitudinal struts 830 may also improve function of the coaptation enhancement implant by allowing the upward rotation between the superior edge of the longitudinal struts and the annular reinforcement strut, such that the superior portion of the implant through the coaptation zone may more closely replicate the motion of a native leaflet during systole.
- the implant longevity may be lessened as the supporting annular reinforcement strut must move each time the surface of the implant moves, and the coaptation between native leaflet and coaptation element may not be optimized by the element having some movement during the cardiac cycle.
- annular anchor eyelet or eyelets 732 which originate near the superior edge of the longitudinal struts 830 may be accomplished in addition to or in lieu of one or more commissural anchors which may or may not be connected to the annular reinforcement strut.
- the annular reinforcement strut is shown in FIGS. 11 C-E as terminating near commissural eyelets 734 .
- Each of the one or more eyelet openings 734 may be formed by a loop of the annular reinforcement strut, or may be separate from the annular reinforcement strut 730 .
- the eyelet may be directly connected to an anchor, or an annular anchor hub 736 either directly, via a tether structure, or through other means.
- localized loops in the annular reinforcement strut 730 may surround and define annular anchor eyelets 732 .
- the implant of FIGS. 11 C-E may comprise a ventricular anchor pledget 762 as a means of connection between the ventricular anchor and the coaptation enhancement element.
- the ventricular anchor pledget may be of generally rectangular shape as shown, or may be square or rounded, elliptical, or any other convenient form.
- the pledget may be comprised of any one of a number of suitable materials known to those of skill in the art. In some instances it may be advantageous to use a material which promotes tissue ingrowth, enhancing the connection of the coaptation implant to the patient's tissue.
- a material which inhibits or is inert with respect to tissue ingrowth may be preferred, such as ePTFE, VTFE, PTFE (poly tetrafluoroethylene), Teflon, polypropylene, polyester, polyethylene terephthalate, or any suitable material.
- a coating may be placed on the pledget to inhibit or encourage tissue ingrowth.
- One or more anchors may penetrate the material of the pledget at a suitable position, securing the pledget to underlying cardiac tissue.
- the pledget may comprise an easily punctured material, such as structural mesh, felt, or webbing.
- FIG. 11 E shows a coaptation element 500 with longitudinal struts 830 ending superiorly in loops with annular anchor eyelets 732 , an annular reinforcement strut 732 , commissural anchor eyelet 734 and commissural anchor hub 736 .
- ventricular pledget 762 is shown coupled to the implant distally 768 . Any means of coupling may be used, including suture, wire, incorporation into the layers of covering, placement of a rivet, or other means.
- Ventricular anchor 866 is seen emerging from delivery catheter 930 and penetrating the pledget 768 .
- Geometry of the implant allows a limited number of implant sizes to cover a wide range of patient measurements. Furthermore, surgeon measurement can be done preoperatively or even intraoperatively with relative ease. Two measurements taken via echocardiogram can be used to determine the appropriate implant size. As shown in FIGS. 16 A-B , end view of the valve permits measurement of the intracommissural distance ICD, and measurement of the long axis of the posterior leaflet 930 can be performed while obtaining an axial view on echocardiogram. Using these two measurements as a guide, appropriate selection from among the coaptation assist elements can be performed. Alternatively, other measurements can be used in combination to guide selection of the appropriately sized implant.
- Echocardiogram it may be possible to use x-ray, CT, cardioscopy, or MRI to obtain measurements. Echocardiograms can be recorded via transthoracic route, trans-esophageal or intracardiac. It will be understood that to those skills in the art that the appropriate imaging modality and angle(s) of view will be used depending on the configuration of the implant and the method of its anchoring.
- the coaptation assistance devices described herein are often configured for transvascular delivery and/or deployment via minimally invasive surgery (e.g. thoracotomy, transapically, via the left atrial appendage (LAA), via the right pulmonary vein, other left atriotomy or the like), with delivery and placement preferably being in between or adjacent to the cardiac valve's native leaflets.
- the valve can be one of the AV valves such as the tricuspid valve and/or the mitral valve.
- the drawings and some embodiments largely relate to the mitral valve, but analogous methods and devices can be applied to the tricuspid valve.
- the coaptation assistance body of the implant can often be delivered by a delivery catheter and may be capable of expanding from a smaller profile to a larger profile to dimensions appropriate for placement in between the valve's native leaflets.
- the implants may also find applications for treatment of nonnative valve leaflets (for example, after valve replacement) or for treatment after the native leaflets have previously been surgically modified.
- the coaptation assist element may be implanted through a minimally invasive or transcatheter technique utilizing a delivery system.
- the delivery system may include a delivery catheter 930 , with delivery catheters comprising a variable stiffness shaft with at least one through lumen, the shaft configured for deflecting along at least a distal section 932 .
- the delivery catheter deflection may be controlled by a catheter deflection or sleeve control knob 938 , via an elongate pull wire extending through the catheter shaft to the deflection zone.
- the delivery catheter may further include a control handle 934 to manipulate the device anchors 866 , 886 and to manipulate the docking and undocking of the device with the delivery catheter.
- the control handle may further include flush, irrigation and/or aspiration ports to remove the air from the system and allow injection of fluids such as saline or contrast media to the site of implantation, and electrical signal connections for monitoring and recording intracardiac electrograms from the distal aspect of the delivery catheter 930 .
- the delivery system may also include at least one torque shaft or other elongate anchor coupling body for manipulating the device anchors, initially deploying and recapturing of the anchors to and from the delivery catheter, and guiding the valve body distally to one or more of the initially deployed anchors.
- the coupling body may be a driver shaft 870 , controlled by the active anchor control knob 940 .
- the anchor(s) and/or coaptation body may be connected to the delivery system via tethers 950 , which allow the connection to be maintained after deployment of the anchor or device while testing the position and function of the implant.
- the tethers allow the implant to be re-secured to the delivery system in the event that placement may be initially sub-optimal, permitting readjustment.
- Tether control knob 942 may be provided on the control handle in order to maintain and manipulate a tether.
- the delivery system may also include an outer sheath or introducer, typically to allow the introduction of the delivery catheter through a lumen of the outer sheath and into the left atrium, so that the outer sheath functions as a transseptal sheath 944 .
- the transseptal sheath may include a variable stiffness outer shaft with at least one lumen, the lumen sized to allow insertion of the delivery catheter 930 and/or coaptation assistance body 500 through the sheath lumen.
- a deflectable distal section of the transseptal sheath 946 may facilitate alignment of the coaptation assistance device with the valve leaflets.
- a transseptal method for treatment of MR will often include gaining access to the left atrium LA via a transseptal sheath.
- Access to the femoral vein may be obtained using the Seldinger technique.
- access can then be obtained via the right atrium 20 to the left atrium 10 by a transseptal procedure.
- a variety of conventional transseptal access techniques and structures may be employed, so that the various imaging, guidewire advancement, septal penetration, and contrast injection or other positioning verification steps need not be detailed herein.
- Steerable transseptal sheaths can have an elongate outer sheath body extending between a proximal handle to a distal end, with the handle having an actuator for steering a distal segment of the sheath body similar to that described above regarding deployment catheter.
- a distal electrode and/or marker near the distal end of sheath body can help position the sheath within the left atrium.
- an appropriately sized deflectable transseptal sheath without steering capability may be guided into position in the left atrium by transseptal sheath or may be advanced into the left atrium without use of a steerable transseptal sheath. Alternatively, deployment may proceed through a lumen of the steerable sheath.
- an outer access sheath will preferably be positioned so as to provide access to the left atrium LA via a sheath lumen.
- deployment catheter may be advanced through the outer transseptal sheath 944 and into the left atrium 10 .
- the distal end of the deployment catheter 946 moves within the left atrium by manipulating the proximal handle and by articulating the actuator of the handle so as to selectively bend the distal end of the catheter body, bringing the distal end of the catheter into alignment and/or engagement with candidate locations for deployment of an anchor, optionally under guidance of 2D or 3D intracardiac, transthoracic, and/or transesophageal ultrasound imaging, Doppler flow characteristics, fluoroscopic or X-ray imaging, or another imaging modality.
- Electrode at the distal end of deployment catheter optionally senses electrogram signals and transmits them to an electrogram system EG so as to help determine if the candidate site is suitable, such as by determining that the electrogram signals include a mix of atrial and ventricular components within a desired range (such as within an acceptable threshold of 1:2). Contrast agent or saline may be introduced through the deployment catheter.
- a separate intracardiac imaging catheter 950 can be advanced into position in order to provide fluoroscopic dye to facilitate intraoperative imaging to check positioning of the implant. Advancement of the transseptal sheath 944 and/or the delivery catheter can be further controlled by preceding it with a radiopaque guide wire 952 , whose position can be confirmed via imaging prior to advancement of the overlying sheath or catheter.
- an anchor Before, during, and/or after the deployment catheter is positioned, engaged with, and/or oriented toward an acceptable target location, an anchor may be advanced distally through a lumen of the deployment catheter, so that the advanced anchor extends from the positioned catheter and into engagement with tissue of the heart at the target location, with advancement of the anchor preferably being performed using an elongate anchor coupling body and an anchor catheter of anchor deployment assembly.
- An electrocardiogram may be recorded from the anchor via the elongate anchor coupling body to further assist in identifying an acceptable target location.
- an atrial anchor may be preferably deployed into the mitral valve annulus by axially advancing the anchor and rotating the helical anchor body through the positioned deployment catheter, screwing the helical body penetratingly into the heart tissue using elongate anchor driver 870 and delivery catheter 930 .
- Delivery catheter 930 can then be retracted proximally from deployed anchor 863 , leaving the anchor affixed to the tissue and associated elongate anchor driver 870 extending proximally from the anchor and out of the body.
- anchor 863 may remain only initially deployed at this stage, as it can be recaptured, removed, and/or repositioned by torquing the elongate anchor coupling body so as to unscrew the helical anchor body.
- delivery catheter can be removed from the outer transseptal sheath 944 leaving anchor driver in place 870 (with the delivery catheter also being withdrawn proximally from over the anchor driver so that the anchor driver may no longer be within the delivery catheter lumen, but remains within the outer transseptal sheath lumen).
- the delivery catheter 930 can then be re-inserted distally through the outer sheath lumen (alongside the elongate anchor coupling body of the deployed anchor) as needed, in FIG. 16 E , the delivery catheter has been reinserted over a second anchor driver coupled to the ventricular anchor 866 .
- the delivery catheter 930 may be manipulated and/or articulated so as to advance valve body distally out of septal sheath 944 and within the left atrium as so that ventricular anchor 866 and distal portion of valve body cross the mitral valve.
- Catheter, guidewire, anchor deployment shaft or another torque-transmission shaft may rotationally engage ventricular anchor, and a hub between the ventricular anchor and valve body may allow relative rotation about the helical axis as described above.
- Tension applied by pulling the proximal ends of anchor drivers while advancing deployment catheter 930 brings the anchors into engagement with the remaining components of the structural interface between valve body and the tissues (such as loops or apertures and atrial member).
- an atraumatic ventricular anchor can be deployed by advancing the anchor and/or withdrawing a surrounding sheath from over the anchor) so that the arms of anchor engage with the highly uneven surface of the ventricular trabeculae, and so that the arms of the anchor are entangled therein sufficiently to restrain the position of the anchor within the ventricle. Note that embodiments of such an anchor need not be configured to penetrate significantly into the ventricular wall (although alternative barbed anchor embodiments can).
- hemodynamic performance of the valve with the valve body therein can be evaluated before decoupling one or more of the anchors from the delivery catheter system (and in some embodiments, even before the ventricle anchor is deployed in ventricle tissue). If results are less than optimal, one or more of the anchors can be detached from the tissue and retracted back into the transseptal sheath, allowing the physician to reposition the anchor and coaptation assistance body.
- the valve body can be withdrawn proximally via sheath and an alternative valve body selected, loaded into the sheath, and deployed if appropriate.
- the atrial and/or ventricular anchors can be redeployed and the surgical staff can again perform a hemodynamic evaluation.
- one or more of guidewire and/or elongate anchor deployment bodies may remain coupled to an associated anchor for hours or even days.
- the device may be locked to the elongate anchor deployment bodies or tethers. Evaluation of placement can be facilitated by radiopaque strut or backbone 948 of the coaptation assist device, which allows evaluation of the position of the implant with relation to the cardiac structures (as seen in FIG. 10 F , where the position of the annulus 60 and ventricle are outlined) and of the suspension between anchors. If the deployment is deemed acceptable, after deploying the ventricular anchor and after the implant is released from the catheter system, the surgical staff can remove the remaining catheter system components and anchor drivers.
- anchor placement will comprise the following steps. First an anchor with attached tether may be coupled to an anchor driver and maneuvered through the delivery catheter and/or the transseptal sheath. Once the desired intracardiac position is determined, the anchor may be placed while coupled to the anchor driver. The anchor driver may then be uncoupled from the anchor and pulled back, leaving the anchor attached to the cardiac structure and with tether in place. This places the anchor under minimal tension, and the attachment and location are then tested.
- the driver may be readvanced over the tether and the anchor re-engaged.
- the anchor may then be withdrawn using the driver and placed at a second site.
- the driver may again be uncoupled and pulled back and the anchor position tested. If either the first or second position is acceptable, the driver can be completely removed and the tether detached without disrupting the anchor. If a new anchor is needed to replace the first anchor, the original anchor may be withdrawn through the delivery catheter via its attachment to the tether.
- the tether rather than being removed after verification of anchor placement, may be permanently implanted under the skin, allowing easy removal of the anchor at a later time.
- the tether can be comprised of any one of a variety of materials, and could be a suture, stainless steel wire, or any other flexible material.
- the steps disclosed above are intended to be non-limiting examples, not necessarily exact. As will be readily apparent to one skilled in the art, the steps may be performed in a different order, and additional or fewer steps may be performed.
- FIG. 17 A shows an embodiment of the delivery catheter 866 with a helical anchor 963 disposed toward the distal end of an anchor driver 870 .
- the anchor driver emerges from the lumen of the delivery catheter sleeve 952 which is attached to delivery catheter control handle 934 .
- a tether 950 passes from connection to the anchor, through the sleeve, and out of an inner lumen of the control handle through the proximal end of the control handle.
- the tether can be manipulated by the surgeon both manually and using the tether control knob 940 .
- Delivery catheter sleeve 952 can be manipulated using the sleeve control knob 938 located in this embodiment at the distal aspect of the control handle.
- FIGS. 17 B and 17 C illustrate the distal end of the anchor driver 870 and delivery catheter 952 uncoupled ( FIG. 17 B ) and coupled ( FIG. 17 C ) to a helical anchor 963 .
- the driver and catheter have been partially retracted from the anchor, and the tether 950 can be seen maintaining control of the anchor.
- the anchor in FIGS. 17 B-I has a sleeve lock ring 960 which, in the coupled position, retains the sleeve of the catheter.
- the key 970 on the distal portion of the driver which may be configured to fit within the key hole 972 of the proximal, coupling portion of the anchor. This prevents rotational slippage between the driver and the anchor and permits the anchor to be screwed into the cardiac structure via driver rotation.
- FIGS. 17 D and 17 E illustrate the unlocked position of the anchor, with sleeve 952 retracted from the proximal attachment area of the anchor and the sleeve lock ring 960 .
- the sleeve control knob 938 is illustrated in the retracted position, proximal to its position during sleeve/anchor engagement, which retracts the sleeve proximally, releasing the anchor.
- the tether control knob 940 is also seen. Rotation of the tether control knob can lock the tether in position relative to the handle or unlock it relative to the handle, permitting tension to be placed on the anchor or removal of the tether from the anchor.
- FIGS. 17 F and 17 G illustrate the locked position of the anchor, with sleeve 952 advanced onto the sleeve lock ring 960 .
- the sleeve control knob 938 may be advanced distally to lock the anchor to the catheter.
- FIG. 17 H illustrates the anchor uncoupled from the driver and the driver partially withdrawn to evaluate the function of the anchor.
- the tether control knob 940 may be unlocked to release the tether from the catheter, then the sleeve control knob 938 may be retracted to release the anchor from the catheter.
- Catheter may be withdrawn over the tether, exposing the tether distally, still coupled to the anchor.
- Tether cross pin 976 is shown in FIG. 17 I , allowing the tether to be easily attached to the anchor by threading a suture around the cross pin. Manipulation may be accomplished by exerting tension on both ends of the tether proximally. Removal of the tether may be easily accomplished by exerting tension on one end of the tether proximally.
- FIG. 17 J illustrates the anchor 963 entirely removed from the tether and delivery catheter assembly after confirming optimal engagement and placement with respect to the cardiac tissue.
- FIGS. 18 A and 18 B illustrate an embodiment of the anchor, further showing the key holes 872 , tether cross pin 976 , and sleeve lock ring 960 which engage with the driver and catheter system.
- the key 970 of the driver shaft is illustrated engaged in the key hold of the anchor to allow rotation in clockwise and counter clockwise directions for placement and removal of the anchor from tissue.
- FIG. 18 C illustrates an alternate embodiment of the anchor with a protective boot or gasket 980 which fits over the proximal aspect of the anchor.
- the boot or gasket has a slit or other opening 982 in its proximal aspect which permits passage of a driver during insertion of the anchor, but, upon retraction of the driver, seals over to protect tissues from the roughness of the proximal end of the anchor and enhance healing.
- the boot would be bonded to the proximal end of the helical anchor 963 or to the stop ring 960 .
- An alternate coupling feature 978 for connecting an anchor to a driver is also shown, though many other variations are possible.
- the protective boot may be comprised of any one of a number of suitable materials, including but not limited to silicone, ePTFE, Dacron, pericardium, or other biologics.
- access to the left atrium can be provided at least in part via a minimally invasive entry in the left atrial appendage or pulmonary vein, or through the left ventricular apex.
- these techniques may be used as a short or intermediate-term therapy, giving patients time and allowing recovery so as to be better able to tolerate an alternative treatment.
- These techniques may also be suitable for re-treatment of patients that have previously had valve therapies.
- These techniques may also be appropriate for placement in positions at the mitral valve in a patient undergoing coronary artery bypass grafting or other cardiac surgery, such as aortic valve replacement.
Abstract
Description
TABLE 1 | |||||
|
Column3 | ||||
Dimension | Range of some embodiments | One embodiment | |||
R1 | 25-35 | mm | 28 | mm | |
R2 | 35-45 | mm | 39 | mm | |
R3 | 5-12 | |
8 | mm | |
D1 | 20-60 | |
40 | mm | |
L1 | 20-80 | |
40 | mm | |
L2 | 10-70 | |
30 | mm |
L2/L1 | 0.6-0.9 | 0.75 |
L3 | 25-100 | mm | 55 | mm | ||
D2 | 3-10 | |
6 | mm | ||
Claims (20)
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US18/296,159 US20230293298A1 (en) | 2011-01-28 | 2023-04-05 | Device, system, and method for transcatheter treatment of valve regurgitation |
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US13/531,407 US8888843B2 (en) | 2011-01-28 | 2012-06-22 | Device, system, and method for transcatheter treatment of valve regurgitation |
US14/542,091 US9592118B2 (en) | 2011-01-28 | 2014-11-14 | Device, system, and method for transcatheter treatment of valve regurgitation |
US15/455,567 US10512542B2 (en) | 2011-01-28 | 2017-03-10 | Device, system, and method for transcatheter treatment of valve regurgitation |
US16/717,363 US11419722B2 (en) | 2011-01-28 | 2019-12-17 | Device, system, and method for transcatheter treatment of valve regurgitation |
US17/870,274 US11678986B2 (en) | 2011-01-28 | 2022-07-21 | Device, system, and method for transcatheter treatment of valve regurgitation |
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US15/455,567 Active 2031-09-23 US10512542B2 (en) | 2011-01-28 | 2017-03-10 | Device, system, and method for transcatheter treatment of valve regurgitation |
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US20130023985A1 (en) | 2013-01-24 |
US20220354648A1 (en) | 2022-11-10 |
US20230293298A1 (en) | 2023-09-21 |
US10512542B2 (en) | 2019-12-24 |
US8888843B2 (en) | 2014-11-18 |
US20200214841A1 (en) | 2020-07-09 |
US9592118B2 (en) | 2017-03-14 |
US11419722B2 (en) | 2022-08-23 |
US20170245994A1 (en) | 2017-08-31 |
US20150164637A1 (en) | 2015-06-18 |
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